I know this has been covered before, but I Google'd and FAQ'd and I'm still confused. So I know the preamp output has to be similar to the power amp's input sensitivity to drive the power amp fully. My problem is that in spec sheets for preamps, I've only seen their gain listed in db. Input sensitivity is measure in Vrms. Everything that talks about preamp output matching input sensitivity lists the preamp output in Vrms. Where is that on all the spec sheets? Or can you calculate it based on the db gain?